The mechanical characteristics of the RAM SO-DIMM are given in JEDEC specification number JEDEC MO190-C. The specification can be found by using the search string MO190-C on the Electronics Industry Association's website at
http://www.jedec.org/DOWNLOAD/default.cfm
The electrical characteristics of the RAM SO-DIMM are given in JEDEC Standard 21-C. The specification can be found by using the search string JESD21-C on the Electronics Industry Association's website at
http://www.jedec.org/DOWNLOAD/default.cfm